John w



(No Model.)

J. W. RAPP.

FIRE PROOF DOOR.

No. 427,362. Patented May 6,1890.

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WITNESSES:

W Mww H/S ATTORNEYS UNITED STATES JOHN XV. RAPP, OF NFNV YORK, N. Y.

PATENT OFFICE.

FIRE-PROOF DOOR.

SPECIFICATION forming part of Letters Patent No. 427,362, dated May 6, 1890.

I Application'filed January 10, 1890. Serial No. 336,517. (No model.)

To all whom it may concern:

Be it known that I, JOHN WV. RAPP, a citizen of the United States, residing at New York,

.county and State of New York,have invented vided with a panel or panels and having its edge bent or turned around a frame, and the other wall being corrugated and held against the frame by the overturned edge of the other Wall; and it further consists in a sheet-metal casing that may be removably secured to the wall of the opening.

I prefer to employ sheet metal, as in case of fire its lateral expansion will not be so great as to tightly secure the door within the opening, as would result in a cast-iron door. By paneling one wall of the door and corrugating the other wall both walls will expand and contract equally without exerting great pressure on the frame so as to distort it.

In the drawings, Figure 1 is a front elevation of a door and easing embodying my improvement. Fig. 2 is a transverse section thereof, and Fig. 3 is a transverse section of the door.

Similar letters of reference designate corresponding parts in all the figures.

Referring by letter to the drawings, A designates the door having the sheet-metal front a and the sheet-metal back a.

B designates the iron framing, which is rectangular in cross-section, and extends entirely around the door and supports the walls thereof.

In the drawings I have shown the front wall a of the door as provided with a panel, which may be stamped or. otherwise formed. I have shown the back wall a as provided with corrugations. These corrugations may extend entirely across the wall a between the framing, as shown in Fig. 3, or a less number of corrugations may be employed, as shown in Fig. 2.

I may state that the positions of walls a a may be reversed-that is, the oorru gated wall may form the front of the door and the paneled wall the rear of the door.

Between the walls a a, I place a fire-proof packing, such as asbestus, mineral wool, plaster-of-paris, or analogous substance. This serves to deaden the sound, and also preserves the sheet metal from damage or denting by substances coming in contact with it.

The wall a of the door has a surrounding flat or non-corrugated edge, which is placed against the rear surface of the framing B. The side and end edges of the wall a are turned over, as at b, against the outer face of the frame B, and inwardly, as at I), over the edge of the wall a.

It will be observed that no rivets or other fastenings are employed to secure the abovedescribed parts together. Therefore the edges of the wall a will render or slide slightly on the framing when the framing expands or contracts.

O designates a sheet-metal boxing, designed to permanently embrace the wall surrounding the shaft-opening. This boxing maybe placed in the opening when the wall is built, or it maybe placed therein after the Wall is built, as the portion 0 may be easily turned against the wall, as shown in the drawings. This boxing is perforated at various points, and a thick metal piece 0 is secured to the boxing adjacent to the perforations, and is provided with a threaded perforation in line with perferations in the boxing. This metal piece 0' may be a long strip, or may be in the form of a nut, one for each perforation, the sole object being to provide a threaded portion sufficiently long to hold a bolt or screw cl, serving to hold the sheet-metal casing D. In Fig. 2 I have shown the relative thickness only of this metal piece. front face or trim decorated in any manner to represent a molding. It has a portion d turned at right angles to the front face, designed to bear against the surface of the boxing. The door is secured by hinges to the casing D. By this construction it will be seen that the door and its casing may be placed in position after the wall is finished, so that there is no danger of damagingthe trim. By removing the screws (Z the door and its The casing D may have its casing may be removed without breaking the wall.

Having described my invention, what I claim is- 1. In a door, the combination, with a metal framing, of two metal Walls, one of said Walls having its edges placed against a surface of the framing, and the other Wall having its edges turned to embrace the outer surfaces of the framing and the edge of the first-named Wall, substantially as specified.

2. In a door, the combination, with a metal framing, of a sheet-metal Wall provided with corrugations,having its edges placed against a surface of the framing, and a sheet-metal Wall having a panel or panels and having its edges turned to embrace the outer surface of 

